- html - 出于某种原因,IE8 对我的 Sass 文件中继承的 html5 CSS 不友好?
- JMeter 在响应断言中使用 span 标签的问题
- html - 在 :hover and :active? 上具有不同效果的 CSS 动画
- html - 相对于居中的 html 内容固定的 CSS 重复背景?
我正在使用 this question 中找到的公式找到 map 上距离当前位置最近的标记。我想修改这个公式,以便它找到最接近的 n
个位置(最近的 5 个位置、最近的 10 个位置等),但我不确定如何完成此操作。
这是我正在使用的修改后的公式:
function rad(x) {return x*Math.PI/180;}
function find_closest_marker(center, map) {
var lat = center.lat();
var lng = center.lng();
var R = 6371; // radius of earth in km
var distances = [];
var closest = -1;
for( i=0;i<markers.length; i++ ) {
var mlat = markers[i].position.lat();
var mlng = markers[i].position.lng();
var dLat = rad(mlat - lat);
var dLong = rad(mlng - lng);
var a = Math.sin(dLat/2) * Math.sin(dLat/2) +
Math.cos(rad(lat)) * Math.cos(rad(lat)) * Math.sin(dLong/2) * Math.sin(dLong/2);
var c = 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1-a));
var d = R * c;
distances[i] = d;
if ( closest == -1 || d < distances[closest] ) {
closest = i;
}
}
//Log title of closest marker
console.log(markers[closest].title);
}
这是我加载标记的方式:
// Add markers to the map
function setMarkers(center, map) {
var json = (function () {
var json = null;
$.ajax({
'async': false,
'global': false,
'url': "js/data.json",
'dataType': "json",
'success': function (data) {
json = data;
}
});
return json;
})();
// Loop over each of the json elements
for (var i = 0, length = json.length; i < length; i++) {
var data = json[i],
latLng = new google.maps.LatLng(data.lat, data.lon);
// Create a marker and place it on the map
var icon = 'assets/marker.png';
var marker = new google.maps.Marker({
position: latLng,
map: map,
icon: icon,
title: data.loc
});
markers.push(marker);
infoBox(map, marker, data);
}
}
如何进一步修改公式,以便找到最接近的 n
个标记,而不仅仅是单个最接近的标记?
最佳答案
您可以使用 this question 中的(稍作修改的)findClosestN
函数(将 gmarkers
更改为 markers
,更改函数以返回 closest
数组仅限于 numberOfResults 元素)
function findClosestN(pt, numberOfResults) {
var closest = [];
for (var i = 0; i < markers.length; i++) {
markers[i].distance = google.maps.geometry.spherical.computeDistanceBetween(pt, markers[i].getPosition());
markers[i].setMap(null);
closest.push(markers[i]);
}
closest.sort(sortByDist);
return closest.splice(0,numberOfResults);
}
function sortByDist(a, b) {
return (a.distance - b.distance)
}
代码片段:
var geocoder = null;
var map = null;
var customerMarker = null;
var markers = [];
var closest = [];
function initialize() {
// alert("init");
geocoder = new google.maps.Geocoder();
map = new google.maps.Map(document.getElementById('map'), {
zoom: 9,
center: new google.maps.LatLng(52.6699927, -0.7274620),
mapTypeId: google.maps.MapTypeId.ROADMAP
});
var infowindow = new google.maps.InfoWindow();
var marker, i;
var bounds = new google.maps.LatLngBounds();
document.getElementById('info').innerHTML = "found " + locations.length + " locations<br>";
for (i = 0; i < locations.length; i++) {
var coordStr = locations[i][4];
var coords = coordStr.split(",");
var pt = new google.maps.LatLng(parseFloat(coords[0]), parseFloat(coords[1]));
bounds.extend(pt);
marker = new google.maps.Marker({
position: pt,
map: map,
icon: locations[i][5],
address: locations[i][2],
title: locations[i][0],
html: locations[i][0] + "<br>" + locations[i][2]
});
markers.push(marker);
google.maps.event.addListener(marker, 'click', (function(marker, i) {
return function() {
infowindow.setContent(marker.html);
infowindow.open(map, marker);
}
})
(marker, i));
}
map.fitBounds(bounds);
}
function codeAddress() {
var address = document.getElementById('address').value;
geocoder.geocode({
'address': address
}, function(results, status) {
if (status == google.maps.GeocoderStatus.OK) {
map.setCenter(results[0].geometry.location);
if (customerMarker) customerMarker.setMap(null);
customerMarker = new google.maps.Marker({
map: map,
position: results[0].geometry.location
});
for (var i = 0; i < markers.length; i++) {
markers[i].setMap(null);
}
var numResults = parseInt(document.getElementById('numberResults').value);
closest = findClosestN(results[0].geometry.location, numResults);
for (var i = 0; i < closest.length; i++) {
closest[i].setMap(map);
}
} else {
alert('Geocode was not successful for the following reason: ' + status);
}
});
}
function findClosestN(pt, numberOfResults) {
var closest = [];
for (var i = 0; i < markers.length; i++) {
markers[i].distance = google.maps.geometry.spherical.computeDistanceBetween(pt, markers[i].getPosition());
markers[i].setMap(null);
closest.push(markers[i]);
}
closest.sort(sortByDist);
return closest.splice(0, numberOfResults);
}
function sortByDist(a, b) {
return (a.distance - b.distance)
}
google.maps.event.addDomListener(window, 'load', initialize);
var locations = [
["John's Pizza", "no", "400 University Ave, Palo Alto, CA", "<Polygon><outerBoundaryIs><LinearRing><coordinates>-122.121277,37.386799,0 -122.158012,37.4168,0 -122.158012,37.448151,0 -122.142906,37.456055,0 -122.118874,37.45224,0 -122.107544,37.437793,0 -122.102737,37.422526,0 -122.113037,37.414618,0 -122.121277,37.386799,0 </coordinates></LinearRing></outerBoundaryIs></Polygon>", "37.447038,-122.160575", "http://maps.google.com/mapfiles/ms/icons/blue.png"],
["JJs Express", "yes", "1000 Santa Cruz Ave, Menlo Park, CA", "<Polygon><outerBoundaryIs><LinearRing><coordinates>-122.200928,37.438611,0 -122.158012,37.4168,0 -122.158012,37.448151,0 -122.142906,37.456055,0 -122.144623,37.475948,0 -122.164192,37.481125,0 -122.189255,37.478673,0 -122.208481,37.468319,0 -122.201271,37.438338,0 </coordinates></LinearRing></outerBoundaryIs></Polygon>", "37.448638,-122.187176", "http://maps.google.com/mapfiles/ms/icons/green.png"],
["John Paul's Pizzeria", "no", "1100 El Camino Real, Belmont, CA", "<Polygon><outerBoundaryIs><LinearRing><coordinates>-122.304268,37.516534,0 -122.300835,37.505096,0 -122.262383,37.481669,0 -122.242813,37.502917,0 -122.244186,37.534232,0 -122.269249,37.550021,0 -122.291222,37.545122,0 -122.302895,37.537499,0 -122.304268,37.516534,0 </coordinates></LinearRing></outerBoundaryIs></Polygon>", "37.520436,-122.275978", "http://maps.google.com/mapfiles/ms/icons/red.png"],
["JJs Express", "yes", "300 E 4th Ave, San Mateo, CA", "<Polygon><outerBoundaryIs><LinearRing><coordinates>-122.304268,37.516534,0 -122.348557,37.538044,0 -122.359886,37.56363,0 -122.364006,37.582405,0 -122.33654,37.589207,0 -122.281609,37.570433,0 -122.291222,37.545122,0 -122.302895,37.537499,0 -122.304268,37.516534,0 </coordinates></LinearRing></outerBoundaryIs></Polygon>", "37.564435,-122.322080", "http://maps.google.com/mapfiles/ms/icons/green.png"],
["John's Pizza", "yes", "1400 Broadway Ave, Burlingame, CA", "<Polygon><outerBoundaryIs><LinearRing><coordinates>-122.374306,37.548933,0 -122.348557,37.538044,0 -122.359886,37.56363,0 -122.364006,37.582405,0 -122.33654,37.589207,0 -122.359543,37.59764,0 -122.372246,37.604712,0 -122.417564,37.594648,0 -122.374306,37.548933,0 </coordinates></LinearRing></outerBoundaryIs></Polygon>", "37.584935,-122.366182", "http://maps.google.com/mapfiles/ms/icons/blue.png"],
["JJs Express", "yes", "700 San Bruno Ave, San Bruno, CA", "<Polygon><outerBoundaryIs><LinearRing><coordinates>-122.462883,37.628916,0 -122.445374,37.639247,0 -122.426147,37.648762,0 -122.405205,37.642238,0 -122.400055,37.628644,0 -122.392159,37.610696,0 -122.372246,37.604712,0 -122.417564,37.594648,0 -122.462196,37.628644,0 </coordinates></LinearRing></outerBoundaryIs></Polygon>", "37.630934,-122.406883", "http://maps.google.com/mapfiles/ms/icons/green.png"],
["JJs Express", "yes", "300 Beach St, San Francisco, CA", "<Polygon><outerBoundaryIs><LinearRing><coordinates>-122.43576,37.790795,0 -122.449493,37.801646,0 -122.425461,37.809784,0 -122.402115,37.811411,0 -122.390442,37.794593,0 -122.408295,37.79188,0 -122.434387,37.789167,0 </coordinates></LinearRing></outerBoundaryIs></Polygon>", "37.807628,-122.413782", "http://maps.google.com/mapfiles/ms/icons/green.png"],
["JJs Express", "yes", "1400 Haight St, San Francisco, CA", "<Polygon><outerBoundaryIs><LinearRing><coordinates>-122.463398,37.760266,0 -122.477349,37.774785,0 -122.427349,37.774785,0 -122.429237,37.763658,0 -122.46357,37.760808,0</coordinates></LinearRing></outerBoundaryIs></Polygon>", "37.770129,-122.445082", "http://maps.google.com/mapfiles/ms/icons/green.png"],
["JJs Express", "yes", "2400 Mission St, San Francisco, CA", "<Polygon><outerBoundaryIs><LinearRing><coordinates>-122.418766,37.747779,0 -122.425289,37.768951,0 -122.406063,37.769901,0 -122.406063,37.749679,0 -122.418251,37.747508,0 </coordinates></LinearRing></outerBoundaryIs></Polygon>", "37.758630,-122.419082", "http://maps.google.com/mapfiles/ms/icons/green.png"],
["JJs Express", "yes", "500 Castro St, Mountain View, CA", "<Polygon><outerBoundaryIs><LinearRing><coordinates>-122.121277,37.386799,0 -122.108917,37.362244,0 -122.077675,37.3385,0 -122.064285,37.378615,0 -122.069778,37.3898,0 -122.076645,37.402619,0 -122.078705,37.411619,0 -122.113037,37.414618,0 -122.121277,37.386799,0 </coordinates></LinearRing></outerBoundaryIs></Polygon>", "37.390040,-122.081573", "http://maps.google.com/mapfiles/ms/icons/green.png"],
["John's Pizza", "no", "100 S Murphy Ave, Sunnyvale, CA", "<Polygon><outerBoundaryIs><LinearRing><coordinates>-122.047119,37.33113,0 -122.065315,37.332495,0 -122.077675,37.3385,0 -122.064285,37.378615,0 -122.036819,37.385162,0 -122.006607,37.382162,0 -122.00386,37.342048,0 -122.047119,37.331403,0 </coordinates></LinearRing></outerBoundaryIs></Polygon>", "37.377441,-122.030071", "http://maps.google.com/mapfiles/ms/icons/blue.png"],
["John's Pizza", "no", "1200 Curtner Ave, San Jose, CA", "<Polygon><outerBoundaryIs><LinearRing><coordinates>-121.935196,37.345051,0 -121.931076,37.294267,0 -121.871338,37.293721,0 -121.806793,37.293174,0 -121.798553,37.361426,0 -121.879578,37.36088,0 -121.934509,37.345597,0 -121.935196,37.345051,0 </coordinates></LinearRing></outerBoundaryIs></Polygon>", "37.288742,-121.890765", "http://maps.google.com/mapfiles/ms/icons/blue.png"],
["John's Pizza", "yes", "700 Blossom Hill Rd, San Jose, CA", "<Polygon><outerBoundaryIs><LinearRing><coordinates>-121.935883,37.253287,0 -121.931076,37.294267,0 -121.871338,37.293721,0 -121.806793,37.293174,0 -121.790657,37.234702,0 -121.852455,37.223221,0 -121.935539,37.253014,0 </coordinates></LinearRing></outerBoundaryIs></Polygon>", "37.250543,-121.846563", "http://maps.google.com/mapfiles/ms/icons/blue.png"],
["John's Pizza", "yes", "100 N Milpitas Blvd, Milpitas, CA", "<Polygon><outerBoundaryIs><LinearRing><coordinates>-121.947556,37.435612,0 -121.934509,37.476493,0 -121.893311,37.469409,0 -121.852798,37.429615,0 -121.843872,37.400165,0 -121.887817,37.3898,0 -121.959915,37.420345,0 -121.959915,37.427979,0 -121.948929,37.435612,0 -121.947556,37.435612,0</coordinates></LinearRing></outerBoundaryIs></Polygon>", "37.434113,-121.901139", "http://maps.google.com/mapfiles/ms/icons/blue.png"],
["John's Pizza", "yes", "3300 Mowry Blvd, Fremont, CA", "<Polygon><outerBoundaryIs><LinearRing><coordinates>-122.02343,37.52198,0 -122.023773,37.558731,0 -121.989784,37.573426,0 -121.959572,37.566351,0 -121.944466,37.544305,0 -121.967125,37.520891,0 -122.023087,37.522525,0</coordinates></LinearRing></outerBoundaryIs></Polygon>", "37.552773,-121.985153", "http://maps.google.com/mapfiles/ms/icons/blue.png"]
];
html,
body,
table,
tbody,
#map {
height: 100%;
width: 100%;
padding: 0;
margin: 0;
}
<script src="https://maps.googleapis.com/maps/api/js?libraries=geometry,places&key=AIzaSyCkUOdZ5y7hMm0yrcCQoCvLwzdM6M8s5qk"></script>
<table border="1" style="height: 90%; width:100%;">
<tr style="height: 100%; width:100%;">
<td style="height: 100%; width:100%;">
<div id="map"></div>
</td>
<td>
<div id="side_bar"></div>
</td>
</tr>
</table>
<input id="address" type="text" value="Palo Alto, CA" />
<input id="numberResults" type="text" value="5" />
<input type="button" value="Search" onclick="codeAddress();" />
<div id="info"></div>
关于javascript - Google map API - 最近的标记功能更改为最近的 n 个标记,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/27905570/
我正在构建一个 RCP 应用程序,其中每个季度都会更新功能/插件。因此,如果用户选择自动更新功能/插件,则会下载更新插件的新 jar,但旧插件仍在使用我不再使用的磁盘空间。 我厌倦了删除包含旧 jar
我如何从外部 Controller 功能中调用 Controller 内部的功能,例如电话间隙回调功能 这是 Controller 外部定义的功能 function onDeviceReady()
如果某个功能(例如 MediaSource)可用,我如何使用 Google Dart 检查。 new MediaSource() 抛出一个错误。如何以编程方式检查此类或功能是否存在?有任何想法吗?是否
我正在尝试运行 Azure Orchestrations,突然我开始从 statusQueryGetUri 收到错误: 协调器函数“UploadDocumentOrchestrator”失败:函数“U
我见过 iPhone 上的应用程序,如果在 3.0 上运行,将使用 3.0 功能/API,例如应用内电子邮件编辑器,如果在 2.x 上运行,则不使用这些功能,并退出应用程序以启动邮件相反。 这是怎么做
这是 DB 规范化理论中的一个概念: Third normal form is violated when a non-key field is a fact about another non-ke
如果我定义 #if SOMETHING #endif 而且我还没有在任何地方定义 SOMETHING。 #if 中的代码会编译吗? 最佳答案 当#if的参数表达式中使用的名称未定义为宏时(在所有其他宏
我刚刚澄清了 A* 路径查找应该如何在两条路径具有相等值的 [情况] 下运行,无论是在计算期间还是在结束时,如果有两条相等的短路径。 例如,我在我的起始节点,我可以扩展到两个可能的节点,但它们都具有相
Java有没有类似下面的东西 宏 一种遍历所有私有(private)字段的方法 类似于 smalltalk symbols 的东西——即用于快速比较静态字符串的东西? 请注意,我正在尝试为 black
这个程序应该将华氏度转换为摄氏度: #include int main() { float fahrenheit, celsius; int max, min, step;
当打开PC缓存功能后, 软件将采用先进先出的原则排队对示波器采集的每一帧数据, 进行帧缓存。 当发现屏幕中有感兴趣的波形掠过时, 鼠标点击软件的(暂停)按钮, 可以选择回看某一帧的波形
我有一个特殊的(虚拟)函数,我想在沙盒环境中使用它: disable.system.call eval(parse(text = 'model.frame("1 ~ 1")'), envir = e
使用新的 Service 实现,我是否必须为我的所有服务提供一个 Options 方法? 使用我的所有服务当前使用的旧 ServiceBase 方法,OPTIONS 返回 OK,但没有 Access-
我正在阅读 Fogus 的关于 Clojure 的喜悦的书,在并行编程章节中,我看到了一个函数定义,它肯定想说明一些重要的事情,但我不知道是什么。此外,我看不到这个函数有什么用 - 当我执行时,它什么
我有大量的 C 代码,大部分代码被注释掉和/或 #if 0。当我使用 % 键匹配 if-else 的左括号和右括号时,它也匹配注释掉的代码。 有没有办法或vim插件在匹配括号时不考虑注释掉或#if 0
我有这个功能: map(map(fn x =>[x])) [[],[1],[2,3,4]]; 产生: val it = [[],[[1]],[[2],[3],[4]]] 我不明白这个功能是如何工作的。
我使用 Visual Studio 代码创建了一个函数应用程序,然后发布了它。功能应用程序运行良好。我现在在功能门户中使用代码部署功能(KUDU)并跳过构建。下面是日志 9:55:46 AM
我有一个数据框df: userID Score Task_Alpha Task_Beta Task_Charlie Task_Delta 3108 -8.00 Easy Easy
我真的无法解决这个问题: 我有一个返回数据框的函数。但是,数据框仅打印在我的控制台中,尽管我希望将其存储在工作空间中。我怎样才能做到这一点? 样本数据: n <- 32640 t <- seq(3*p
有没有办法找出所有可能的激活器命令行选项? activator -help仅提供最低限度的可用选项/功能列表,但所有好的东西都隐藏起来,即使在 typesafe 网站在线文档中也不可用。 到目前为止,
我是一名优秀的程序员,十分优秀!